... Error: <=5%LEL 3.Resume density:8% LEL GA-338 Gas Detector 1. Voltage:AC220V or DC12V2. Sound pressure range:≥70dB ... density:8% LEL5. Induced gas: coal gas, natural gas, LPG6. Alarm mode: flash & sound alarm,automatically shut-off gas valve, network alarm signal output7. Alarm ... Lock, Electric Strike, Time Attendance and Biometrics, etc. GA-338 Gas Detector